\documentclass{article}
\begin{document}

\paragraph{So what?} This long line is not perfectly wrapped, it seems the initial `paragraph{something}' is not taken into account in the count of characters. The following lines get nicely wrapped as intended, no problem with this.
\paragraph{And with colors?} \emph{This long line is not perfectly wrapped, it seems the command `emph' command is not taken into in the count of characters. The following lines get nicely wrapped as intended, no problem with this.}

\begin{description}
	\item[Thing1:] This long line is not perfectly wrapped, it seems the initial `item[Thing1:]' is not taken into account in the count of characters. The following lines get nicely wrapped as intended, no problem with this.
	\item[Thing2:] This long line is also not perfectly wrapped, it seems the initial `item[Thing2:]' is not taken into account in the count of characters either. The following lines get nicely wrapped as intended, no problem with this.
\end{description}

\end{document}
